Disabling JIT has not changed the "Quick-Fire-Button-Problem". Maybe its in the Game itself. I don't remember how quick it was during real Amiga use. The switch between the option lines (Musik, FX, Abfragen) is not too quick (no double switch) so I think its ok.

How about quitting the game back to the Workbench? Is there an Amiga System Shortcut similar to Alt-F4 in Windows?